摘要
以清酱肉为研究对象,提取并通过超滤分离得到清酱肉多肽(分子质量<10 kDa),测定不同质量浓度多肽液对1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl,DPPH)自由基、羟自由基(·OH)的清除效果、Fe2+螯合能力和还原能力,分析清酱肉多肽的氨基酸组成。结果表明:当清酱肉多肽液的质量浓度为5 mg/mL时,其对·OH和DPPH自由基的清除率分别可达51.49%和57.50%,与相同质量浓度的谷胱甘肽(glutathione,GSH)相比差异显著(P<0.05);清酱肉多肽的Fe2+螯合能力随其质量浓度的增加而显著提高,当质量浓度为5 mg/mL时,其对Fe2+的螯合率可达50.97%;清酱肉多肽还具有一定的还原性。此外,清酱肉多肽液的氨基酸组成较为丰富,其中必需氨基酸含量为29.14%;与抗氧化活性相关的碱性、酸性及疏水性氨基酸的总量达到87.75%。综上所述,清酱肉多肽液具有一定的抗氧化能力及营养价值。
In this experiment, peptides(molecular mass < 10 kDa) were extracted from pickled sauced meat and separated by ultrafiltration. Antioxidant activities of the peptides were evaluated by determining scavenging activities against1,1-diphenyl-2-picrylhydrazyl(DPPH) and hydroxyl radicals, Fe2+ chelating capacity and reducing power. Furthermore, the amino acid composition was analyzed. The results showed that the percentage scavenging of hydroxyl and DPPH radicals by the peptides at 5.0 mg/mL was 51.49% and 57.50%, respectively, highly signi?cantly different from that by glutathione(GSH) at the same concentration(P < 0.05). The Fe2+ chelating capacity of the peptides was signi?cantly concentrationdependently enhanced, and at a concentration of 5 mg/mL, the percentage chelating of Fe2+ was 50.97%. Also the peptides showed reducing power. In addition, the amino acid composition of the peptides was abundant, with essential amino acids accounting for 29.14% of the total amino acids. The content of antioxidant amino acids including acidic amino acid, basic amino acid and hydrophobic amino acid was as high as 87.75%. In summary, the peptides extracted from pickled sauced meat has antioxidant activity and nutritional value.
引文
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